Exchange Web Services sent an HTTP response with no content: This indicates that Exchange Server unexpectedly returned no content when asked to provide data using EWS (Exchange Web Services API). This error may occur when trying to retrieve content for items which are marked as pending send or whose submission failed. In some cases, these items may appear to be "stuck" in their folder and display in italic font (when viewed using Microsoft Outlook or Outlook Web Access).
- Check for stuck items in the Sent Items and Outbox folders.
- Check for items in italic font in the Sent Items and Outbox folders.
- Resend, delete, archive, or move the offending items.